Space Charged Limited Currents in Liquid Dielectrics
The majority of conduction experiments in liquid dielectrics are based on the use of metal electrodes, but the metal-to-dielectric interface acts as a blocking contact, or at best a poor injector. Charge injection from metal electrodes does set in at high fields, but it occurs from microscopic asperities on the electrodes, so the emission is nonuniform. For the purpose of studying charge transport phenomena, therefore, experimental techniques are required that provide a uniform, copious source of charge carriers, and several approaches to this have been proposed: for example, Adamczewski , Freeman , Schmidt  Hummel and Allen and others have used x-rays to introduce excess carriers into dielectric liquids; Silver et al.  have shown that the tunnel junction can be used as an injecting electrode; members of the CNRS group have exploited the ion-exchange membrane as an injecting contact . LeBlanc  used a photocathode to inject electrons into hydrocarbon liquids; Hartmann and Schmidlin  used a photoconductive layer as an injecting contact, and Watson, Schneider, and Till  have used an electron beam as an ohmic contact.
KeywordsSpace Charge Virtual Cathode Liquid Dielectric Space Charge Density Space Charge Limited Current
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